Universal Telescopic Louvered Panel Attachment and System for Passive Stack Effect Cooling in a Data Center

ABSTRACT

A telescopic louvered panel and system for enhancing cold aisle and hot aisle passive stack effect cooling efficiency in a data center is provided. The panel has a panel frame with a pair of vertical side walls. Each of the side walls has a back flange portion with mounting apertures for mounting the panel frame to either one of a computer cabinet or server door. A series of horizontally telescoping blade members have opposite ends which are pivotally connecting the side walls. The blade members are capable of slidably adjusting a width dimension of the frame, and pivoting on a horizontal plane. A vertical tilt bar links the blades together so that the blades push to open and close in unison.

CROSS REFERENCE TO RELATED APPLICATIONS

Pursuant to 35 U.S.C. 120, the Applicant claims the benefit of U.S. Ser.No. 13/135,452, filed Jul. 6, 2011, pursuant to 35 U.S.C. 111(a), whichclaims the benefit, pursuant to 35 U.S.C. 119(e), of U.S. Ser. No.61/398,893, filed, pursuant to 35 U.S.C. 111(b), on 6 Jul. 2010.

STATEMENT OF FEDERALLY SPONSORED RESEARCH

Not Applicable.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to passive cooling of computer servers ina data center. In particular, it relates to an improved telescopiclouvered panel attachment and system for enhancing hot aisle and coldaisle passive stack effect cooling in a data center.

2. Description of the Related Art

Raised floors are used in data centers to create a space between asub-floor of the building and the normal working environment of thecomputer room. The space between the sub-floor and the raised floorpanels creates an under-floor cool-air circulating plenum for thermalmanagement of the data processing servers installed in banks of racksystems installed on top of the raised floor. The floor panels,themselves, are either solid or perforated.

Overall, the cooling components, of a computer room, are charged withcreating, and moving air on the data center floor. From there, the roomitself must maintain separate climates in relation to the cool air,which is required by the servers, and the hot air which they exhaust.Without separate boundaries, the air paths mix, resulting in botheconomic and ecological consequences.

Air-grate floor panels are used to separate the computer room into alower-plenum and upper-plenum air handling boundary configuration wherethe cooling air “originates” in the lower plenum, flows upwardly throughthe openings in the air-grate panels, and is made available to flowthrough the cold air intake apertures in the server doors, for coolingthe server cabinets installed in the upper plenum on the raised floor,of the computer room. In operation, the data processors heat the air, asit flows through the server, and the heated air is returned to thecomputer room air conditioning units (“CRAC”) where the heated air iscooled and recycled back into the lower, or under-floor, plenum.

A further refinement came when the industry generally accepted thedesign concept of “hot aisle and cold aisle” containment, as anadditional means for thermal separation in the computer room. Thisdesign uses a combination of the CRAC units, duct work, and perforatedair-grate floor panels to achieve hot aisle/cold aisle air flowseparation. The installation aligns data center cabinets intoalternating rows, endures in critical facilities throughout the world,and is widely regarded as the first major step in improving airflowmanagement. In use, part of the air flow enters the server racks, andpart of the air flow bypasses the server cabinets and returns to theCRAC air handling units. That portion of the air which enters theservers, through the server door intake, is heated, the heated air isthen exhausted through the server cabinet back panel, and the heated airis then returned to the CRAC air handling units for recycle into thelower plenum. Typically, some intermixing of the hot and cold air pathsis experienced due to improper sealing in the rack, or recirculationabove and around the sides of the rack rows, which lowers theoperational thermal efficiency of the system.

Other conditions might occur which interfere with achieving optimumcooling efficiency in a “hot aisle/cold aisle” construction, as well.For example, “bypass air” is an interfering condition often observedwhen conditioned air escapes through cable cut-outs, holes undercabinets, misplaced perforated tiles, or through holes in the perimeterwalls of the computer room. Bypass air limits the precise delivery ofcold air at the server door intake.

“Hot air recirculation” is also an interfering condition found underconditions where waste heat enters the cold aisle. In order to combatthis condition, operators ensure that the cooling infrastructure mustthrow colder air at the equipment to offset mixing. Hot aircontamination is also a condition which prohibits the CRAC units fromreceiving the warmest possible exhaust air which renders their operationless efficient. Finally, hot spots may still persist as a result of any,or all, of the above conditions.

It is desirable to process even greater volumes of data at highervelocities. However, a problem exists because such advancements lead toproportional increases in the operational energy of thermal dissipationfor any given system. Indeed, those observed increases, in the thermaldissipation energy, are now exceeding even the most advanced operationaldesign limitations. Thus, certain operators are now working on differentways to lower the temperature set-point of the entire data center inorder to enhance cooling of those computer servers which are positionedin the upper reaches of the server racks installed in the upper plenum.

One such solution to the problem is directed toward an effort incontinuing to redesign the air flow characteristics of the air-gratepanels themselves. For example, in U.S. Pat. Ser. No. D567,398, Meyerteaches the design of air-grate floor panels having air scoopsprojecting downwardly as part of the superstructure of the air-gratesub-frame. It is readily apparent that this scoop design would act tocapture conditioned air, as it flows in a generally horizontal directionthrough the lower plenum of a raised floor, and redirect it upwardlyinto the upper plenum through the slotted perforations in the air-grateraised floor panel plate.

As above, the concept of “hot aisle/cold aisle” employs improvements inthe design and location of the CRAC units, duct work, blowers, and theraised floor panels themselves, as a cooling infrastructure whichfocuses on a separation of the make-up cold air and the exhaust hot airthroughout the system. However, some additional design improvements haveyet to be fully realized. One such improvement, would take intoconsideration certain modifications to the server door air intakeconfiguration.

Early versions of server enclosures, often with “smoked” or glass frontdoors became obsolete with the adoption of “hot aisle/cold aisle”technologies. As a result, the use of ventilated doors became necessaryfor use with the “hot aisle/cold aisle” passive cooling approach. Forthis reason, perforated doors have gained wide acceptance in theindustry for most off-the-shelf server enclosures. One improvement inthe overall design of the computer server doors and back panelenclosures has been published in U.S. Pat. Publ. No. US-2012-009862-A1,to Meyer. There, Meyer teaches the use of either one of a louveredserver door and cabinet back panel which opens and closes to variablyrestrict or direct a cooling airflow and hot air exhaust through theserver cabinet. The louvered doors and back panels enhance a new conceptusing a hot aisle and cold aisle passive “stack effect” cooling dynamicwhich is based on a thermal buoyancy differential between the cold airand hot air streams in a system.

While the foregoing louvered server doors and cabinet back panelsillustrate useful improvements for enhancing hot aisle and cold aislepassive stack effect cooling technology, these assemblies often requirecustom fabrication and are thus often unsuitable for inventory,immediate shipment, and use. Thus, what is needed is an improvedlouvered panel attachment which is mountable for retrofit installationon an existing server door and cabinet panel, together with an improvedsystem for hot aisle and cold aisle passive stack effect coolingefficiency in a data center. The present invention satisfies theseneeds.

BRIEF SUMMARY OF THE INVENTION

It is therefore an object of the present invention to provide animproved louvered panel attachment which is mountable for retrofitinstallation on an existing server door and cabinet panel.

It is yet another object of the present invention to provide an improvedsystem for hot aisle and cold aisle passive stack effect coolingefficiency in a data center.

To overcome the problems of the prior art, and in accordance with thepurpose of the present invention, as embodied and broadly describedherein, briefly, a universal telescopic louvered panel attachment isprovided for enhancing cold aisle and hot aisle passive stack effectcooling efficiency in a data center. The attachment has a panel frame.The frame has a pair of vertical side walls. Each of the side walls,have a front edge, a back edge, and a flange portion. The flange ispositioned adjacent to the back edge. Each of the flanges have mountingapertures. The mounting apertures are adapted for receiving a fastenerfor mounting the panel frame to either one of a computer cabinet orserver door. A series of horizontally telescoping blade members areconstructed of first and second sheets. Each of the sheets havecorresponding parallel laces that slide-by adjacent each other in ahorizontal direction. The telescoping blade members have opposite endswhich are pivotally connecting the side walls. The blade members arecapable of slidably adjusting a width dimension of the frame, andpivoting on a horizontal plane. A vertical tilt bar is pivotallyconnected to each of the blades. The tilt bar links the blades togetherso that the blades push to open and close in unison.

Additional advantages of the present invention will be set forth in partin the description that follows and in part will be obvious from thatdescription or can be learned from practice of the invention. Theadvantages of the invention can be realized and obtained by theinvention particularly pointed out in the appended claims.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The accompanying drawings, which are incorporated in and whichconstitute a part of the specification, illustrate at least oneembodiment of the invention and, together with the description, explainthe principles of the invention.

FIG. 1 is a front view of the louvered panel in accordance with thepresent invention.

FIG. 2 is a back view of the louvered panel in accordance with thepresent invention.

FIG. 3 is a front view of the preferred embodiment of the telescopicblade member assembly.

FIG. 4 is a back view of the telescopic blade member assembly shown inFIG. 3 showing the sheet members slidably extended outwardly to increasethe width dimension of the blade assembly to retrofit existingapplications.

FIG. 5 is a side view of a panel frame sidewall showing a preferredembodiment of the telescoping blade members, vertical tilt bar, and stoppin receiving holes.

FIG. 6 is an enlarged portion of that view shown in FIG. 3.

FIG. 7 is an isometric view of the preferred embodiment of the presentinvention when mounted on an anterior portion of a computer server doorover a meshed air intake portion of the server door.

FIG. 8 is an isometric view of the preferred embodiment of the system,of the present invention, showing the louvered panel attachment mountedon a row of server doors for directional cooling of those computerservers, when aligned facing a cold aisle raised floor air-grateconstruction.

FIG. 9 is an isometric view of the preferred embodiment of the system,of the present invention, showing the cold aisle and hot aisleconstruction of the raised floor assembly, with the louvered panelattachments mounted on the server doors and one the back panels toenhance passive stack effect cooling efficiency in a data center.

FIG. 10 is an isometric view of yet another preferred embodiment of thesystem, of the present invention, showing use of the louvered panel,duct work and CRAC units to generate the cold aisle and hot aislebarriers in a solid floor assembly.

DETAILED DESCRIPTION OF THE DRAWINGS

Unless specifically defined otherwise, all scientific and technicalterms, used herein, have the same ordinary meaning as would be commonlyunderstood by one of ordinary skill in the art to which this inventionbelongs. In practice, the present invention improves “cold aisle and hotaisle passive stack effect” by generally ensuring that the cold airstays at the server intake, while the computer room air conditioners, orair handlers, receive the warmer exhaust air, improving their stackeffect efficiency. Moreover, the invention enhances the “capture ofexhaust air” via in-row air conditioners which condition it and returnit via the lower plenum and air-grate cold aisle formed with the presentinvention. The term “lower plenum” means that portion of the computerroom below the air-grate floor panels when installed on a pedestalsupport system. The term “upper plenum” means that portion of thecomputer room existing above the air-grate floor panels, including thedata processing server equipment and in-row air conditioners, or airhandling units. Thus, the term “computer room” means the overall airhandling environment including the upper and lower plenums from thesubfloor to ceiling. Finally, “CRAC units” means those computer room airconditioning units typically located at the perimeter of the data centerfloor surrounding the (server) racks, or in-rows, to circulate air inthe data center space to create a cooling loop. The phrase “stackeffect” means the differential in the buoyant density of cooling airrelative to the heated exhaust air which drives the passive coolingimprovement efficiency in accordance with the present invention.

Although any methods and materials similar or equivalent to thosedescribed herein, can be used in the practice or testing of the presentinvention, the preferred methods and materials are now described.Reference will now be made in detail, to the presently preferredembodiments of the invention, including the examples of which areillustrated in the accompanying drawings. In the drawings, like numeralswill be used in order to represent like features of the presentinvention.

The present invention provides an improved universal telescopic louveredpanel attachment 10 for enhancing cold aisle 36 and hot aisle 38 passivestack effect cooling efficiency in a data center. In the presentlypreferred embodiment, the attachment 10 has a panel frame. The panelframe includes a pair of vertical side walls 4. Each of the side walls4, have a front edge 5, a back edge, and a flange portion 6. The flangeportion 6 is positioned adjacent to the back edges. Each of the 6 havemounting apertures 8. The mounting apertures 8 are adapted for receivinga fastener, such as a rivet, pin, screw or bolt, for mounting the panelframe sidewalk 4 to either one of a computer cabinet 24 or server door20.

FIGS. 3 and 4 illustrate a preferred embodiment of the blade members 11.There, the panel attachment 10 includes a series of horizontallytelescoping blade members 11 constructed of first 1 and second 2 sheets.The first sheet 1 includes top and bottom u-shaped channels, preferablybeing bend formations, for slidably receiving the smooth outer edges ofthe second 2 sheet. Each of the sheets 1, 2, have corresponding parallelfaces that slide-by adjacent each other in a horizontal direction. Thetelescoping blade members have opposite ends which are pivotallyconnecting the side walls 4. The blade members are thus capable ofslidably adjusting a width dimension of the frame, and pivoting on ahorizontal plane. The width adjustment is predetermined so that theframe fits either within the server door frame 22 or on the back cabinetpanel 26. The sidewalls 4 and blade members 11, including first sheet 1and second sheet 2 are desirably constructed of steel being 1-2 mm inthickness. In this manner, the flange 6 and U-shaped channel of sheet 1are easily formed by bending.

The panel attachment 10 retrofit solution is a result of the novelfeature being the telescopic blade members 11 being the connectingmembers to the sidewalls 4. In this manner, the overall widthinstallation dimension of the panel frame 10 is adjustable for mountingon either server doors or back panels, within a predetermined range. Forexample, it Would be desirable to inventory the telescoping panel 10attachment in sizes having a contraction and expansion capability withinranges of: 20.3-30.5; 27.9-45.7; and 50.8-91.4 centimeters. These rangesare not merely elements of design, but are functionally related to thoseserver door frames 22 sizes which have gained wide acceptance for use inthe industry.

A vertical tilt bar 12 is pivotally connected to each of the blades. Thetilt bar 12 links the blade member 11 together so that the blade members11 push to open and close in unison. In this manner, and specificallycontemplated herein, the blade members 11 may include manually, orelectrically, driven drive linkages (not shown) connected to the tiltbar 12 for operating the blades in a range of positions, between openand closed, depending on the desired setting for the desired air flowrate through the servers, to be cooled. It is also desirably to includeeither manual or electronic control systems for the thermostatic controlof the blade members 11 during operation.

Referring to FIGS. 3 and 4, in the presently preferred embodiment, theblade members 11 may, but need not, include a valley 3, being a bendalong their chord axis, which forms a first plane 16 and a second plane18 being inclined relative to the first plane 16. Moreover, at least oneof the side walls 4 includes a series of clear holes drilled in anelliptical array which are adapted to receive at least one stop pin (notshown). When located, the stop pin is capable of retaining thetelescoping blade members in a predetermined open and close position.The blade members 11 are preferably constructed of a 1-2 mm thick steelsheet material, whereby the valley between the first face 16 andinclined face 18 is formed as a bend in the sheets 1, and 2.

In use, the foregoing telescopic panel attachment is a component of thesystem, of the present invention, for improving cold aisle/hot aislepassive stack effect cooling efficiency in a data center. As such, theair-grate floor panels 30 are elements of the system. The air-gratepanels 30 include a perforated top plate, having upper and lowersurfaces. The top plate is attached to a load bearing sub-frame. Thesub-frame typically includes four vertical girders, connected in aninety-degree alignment, to one another, so that four corners of theframe are capable of supporting the air-grate 30 as an air handlingseparation barrier on a raised floor pedestal 34 support system. Theair-grate 30 is preferably fabricated of a steel plate which is cut,welded, drilled, die-cast, and/or pressed in to subassemblies, orcompleted panels, in the shop for final finishing, such as powdercoating, warehousing, order, and rapid shipment. The top plate includesa plurality of openings which may be circular, but are desirably slottedwith a long axis installed to extend perpendicular to the frontal planeof the server cabinet doors when aligned facing the cold aisle.

FIG. 9 illustrates the presently preferred embodiment of the system ofthe present invention. Here, the system is designed for use on anyraised floor pedestal support system which is well known in the art.Such systems typically include a plurality of vertically extendingpedestal support members 34. The pedestal support members 34 aretypically provided with an upper externally threaded rod, connected to apedestal support head, and a lower internally threaded tube, connectedto a pedestal support base. The pedestal support bases are connected tothe subfloor of a raised floor data center building construction. Thepedestal supports 34 are each connected in a square, or rectangular,matrix orientation with a plurality of horizontal stringers. The matrixis configured in a predetermined dimension which is consistent with thedimension of the air-grates 30 and solid top panels 33, to be installedon pedestal support heads and stringers. The air-grate floor panels 30are mounted in a course, or row, on the pedestal heads and stringers sothat a cold aisle 36 is formed facing the server doors 20 in a row ofdata processing servers 24.

The CRAC units 28 are used to remove and return heated air 32, separatedin the upper plenum, cool that air, and pressurize the lower plenum witha predetermined volume of the cooling air 31. Heated return air (27° C.)32, is generated during the operation of the data servers 24 when it isexhausted through the servers 24 and into the hot aisles 38 behind theservers 24. The heated air 32, or return air, flows into the CRAC units28 which are located in the computer room on top of the raised floor. Inthis example, the return air 32 is conditioned to 18° C., by the CRACunits 28, and is ducted downwardly into the lower, or under-floor,plenum where it acts to pressurize the lower plenum, causing a positivepressure differential, in relation to the upper plenum portion of thecomputer room. This pressure differential causes the conditioned coolingair 31 to be forced through the lower plenum, upwards through the slotsin the air-grates 30 forming the cold aisle 36 in a direction whichimpacts the panel attachment 10 blade members 11. The blade members 11direct or restrict the conditioned cooling air relative to the cold airintake 21. Impact and stratification dynamics, inherent in the use ofthe novel system disclosed herein, act to cause the cooling air 31 toflow in a direction which continually passes the blade members 11 andfrontal intake portions 21 of the server doors 20. As this cooling air31 passes the front air intake 21 of the server cabinets, the serverfans operate to evacuate the conditioned air through the server cabinet24 where it is heated and exhausted (32° C.) out of the back 28 of theserver cabinets 24, and into the hot aisle 38. The hot air 32 exhaustthen becomes the make-up return air for recycle through the system.

A computer rack, contains the computer servers 24 within the upperplenum defined by the raised floor. The server cabinets 24 are generallyaligned side-to-side in rows with the server doors 20 facing on oppositesides of the air-grate 30 panels which establish a component of the coldaisle 36. Each row may include any stack of servers 24, in racks, as arewell known in the art. The computer server cabinets 24 are generally0.9-3.0 meters tall being a box shaped cabinet. At least one server door20 is attached to the server cabinet 24 with by hinged positioned alongone edge. The server doors 20 include a door frame 22 and a cold airintake 21. The server cabinets 24 also include a ventilated back panel26, or door. As shown in the drawing figures, the back panels 26, of theserver cabinets 23, are oppositely aligned side-to-side in rows facingthe solid surface panels 33 to establish hot aisle 38.

In use, the panel attachment 10 is spread to for press-fitment with aninside portion of an existing door 20 frame 22. The blade members 11 areadjusted with tilt bar 12 to a fully open position which revealsmounting apertures 8 in flanges 6 of sidewalls 4. The sidewalls 4 arefastened to the door frame 22 using fasteners, such as a rivet, screw,bolt, or pin, so that the panel attachment overlays to door cooling airintake 21. The blade members 11 are then adjusted to a predeterminedposition either manually or with direct digital control of the tilt bar12 assemblies.

Turning now to FIG. 10, where it is shown yet another preferredembodiment of the system, of the present invention, the computer room inconstructed with a solid floor and the CRAC units 28 and a ductingsystem generate an air handling loop relative to the cold aisles 36 andhot aisles 38. The solid floor may, but need not, be constructed as amatrix of substantially solid top raised access floor panels 33 carriedon a raised floor pedestal support assembly. Here, the CRAC units 28 areused to evacuate and remove the heated air 32, dissipated throughoperation of the servers 24 from the hot aisles 38, through a ductingsystem and recycle the heated air 31 back into the CRAC units 28. Theheated air 32 is desirably conditioned by the CRAC units 28 toapproximately 18° C., and the conditioned cooling air 31 is thenforcibly directed through the ducting system for contained supply intothe cold aisle 36. Again, the pressure differentials, establishedthereby, causes the conditioned cooling air 31 to be forced in adownward direction from the ducting system into the cold aisle 36 whereit impacts the panel attachment 10 blade members 11. With thisembodiment, the panel attachment is mounted on the server door 20 sothat the blade members 11 are operable upwardly to supply conditionedcooling air 11 into the cold air intake portions 21, of the server doors20. As the cooling air 31 passes the frontal air intake 21 portions ofthe server doors 20, the server exhaust fans operate to evacuate theconditioned air 21 through the server cabinet 24 where it is thermallydissipated and exhausted our of a ventilated portion in the back panel26 of the server cabinet 24 into the hot aisle 38.

While the present invention has been described in connection with theillustrated embodiments, it will be appreciated and understood thatmodifications may be made without departing, from the true spirit andscope of the invention.

I claim:
 1. A universal telescopic louvered panel attachment forenhancing cold aisle and hot aisle passive stack effect coolingefficiency in a computer room, comprising: (a) a panel frame, said panelframe having a pair of vertical side walls, each of said side walls,having a front edge, back edge, and a flange portion adjacent to saidback edge, wherein said flange includes a plurality of mountingapertures being adapted for receiving a fastening means for mountingsaid panel frame to either one of a computer cabinet or server door; and(b) a series of horizontally telescoping blade members, said blademembers being a combination including a first sheet and a second sheet,said sheets having corresponding faces adapted to slide-by adjacent eachother in a horizontal direction, and whereby said telescoping blademembers are pivotally connecting said side walls, at opposite endsthereof, so that said blade members arc capable of slidably adjusting awidth dimension of said frame, and pivoting on a horizontal plane withinsaid frame.
 2. The telescopic attachment according to claim 1, furthercomprising a vertical tilt bar pivotally connected to each of said blademembers, said tilt bar linking said blade members together so that saidblade members operate to open and close in unison.
 3. The telescopicattachment according to claim 1, whereby said corresponding facesinclude a first and a second parallel planes, said second plane beinginclined relative to said first plane, said panes being demarcated by ahorizontal valley formed therebetween.
 4. The telescopic attachmentaccording to claim 1, wherein at least one of said side walls includesan elliptical array of clear holes, said clear holes being capable ofreceiving at least one stop member, said stop being capable of retainingsaid telescoping blade members in a predetermined open and closeposition.
 5. A system for enhancing cold aisle and hot aisle passivestack effect in a computer room, comprising: (a) a cold aisle; (b) a hotaisle; (c) an air conditioning and ducting system capable of circulatinga cooling airflow in said cold aisle and a heated airflow in said hotaisle; (d) a row of computer server cabinets, each of said cabinetshaving an anterior server door, and a back panel, said server doorsincluding a cooling air intake and said back panel adapted for thermaldissipation, said row of said server cabinets being aligned in saidcomputer room so that said server doors are facing said cold aisle andsaid back panels are facing said hot aisle; and (e) a louvered panelattachment being mounted on either one of said server cabinet doors orback panels, said louvered panel attachment being a panel frame and aseries of horizontally telescoping blade members, said panel framehaving as pair of vertical side walls, each of said side walls having afront edge, back edge, and a flange portion positioned adjacent to saidback edge, wherein said flange portion includes a plurality of mountingapertures being adapted for receiving a fastening means for mountingsaid panel frame to either one of said server doors or back panels, saidblade members being an assembly including as first sheet and a secondsheet having parallel corresponding faces that slide-by adjacent eachother in a horizontal direction, whereby said telescoping blade membersare pivotally connecting said side walls, at opposite ends thereof, sothat said blade members are capable of slidably adjusting a widthdimension of said frame, said width dimension being relative forattachment to either one of said cabinet doors or cabinet back panels,whereby said blade members are capable of pivoting on a horizontal planewithin said frame.
 6. The system according to claim 5, furthercomprising a vertical tilt bar assembly pivotally connected to each ofsaid blade members, said tilt bar assembly linking said blade memberstogether so that said blades operate to open and close in unison.
 7. Thesystem according to claim 5, wherein said computer room includes araised floor assembly being a matrix of raised floor panels carried on apedestal support system, said raised floor assembly defining a lowerplenum and an upper plenum, and said ducting system further includes arow of air-grate floor panels capable of directing said cooling airflowfrom said lower plenum into said cold aisle.
 8. The system according toclaim 5, wherein said air conditioning and ducting system includes aloop comprising a first ducting and a second ducting, said first ductingand said second ducting being positioned in an alternating alignment sothat said first ducting is capable of supplying said cooling airflowinto said cold aisle and said second ducting is capable of removing saidheated airflow from said hot aisle.
 9. A method for enhancing cold aisleand hot aisle passive stack effect in a computer room, comprising; (a)providing a cold aisle; (b) providing a hot aisle; (c) providing an airconditioning and ducting system capable of circulating as coolingairflow in said cold aisle and a heated airflow in said hot aisle; (d)providing a row of computer server cabinets, each of said cabinetshaving an anterior server door, and a back panel, said server doorsincluding a cooling air intake and said back panel adapted for thermaldissipation, said row of said server cabinets being aligned in saidcomputer room so that said server doors are facing said cold aisle andsaid back panels are facing said hot aisle; (e) providing a louveredpanel attachment being mounted on either one of said server cabinetdoors or back panels, said louvered panel attachment being panel frameand a series of horizontally telescoping blade members, said panel framehaving a pair of vertical side walls, each of said side walls having afront edge, back edge, and a flange portion positioned adjacent to saidback edge, wherein said flange portion includes a plurality of mountingapertures being adapted for receiving a fastening means for mountingsaid panel frame to either one of said server doors or back panels, saidblade members being an assembly including a first sheet and a secondsheet having parallel corresponding faces that slide-by adjacent eachother in a horizontal direction, whereby said telescoping blade membersare pivotally connecting said side walls, at opposite ends thereof, sothat said blade members are capable of slidably adjusting a widthdimension of said frame, said width dimension being relative forattachment to either one of said cabinet doors or cabinet back panels,whereby said blade members are capable of pivoting on a horizontal planewithin said frame; and (f) operating said air conditioning and ductingsystem in combination with the lowered panel attachment to optimize acold aisle and hot aisle passive stack effect cooling efficiency. 10.The method according to claim 9, further comprising a vertical tilt barassembly pivotally connected to each of said blade members, said tiltbar assembly linking said blade members together so that said bladesoperate to open and close in unison.
 11. The method according to claim9, wherein said computer room includes a raised floor assembly being amatrix of raised floor panels carried on a pedestal support system, saidraised floor assembly defining a lower plenum and an upper plenum, andsaid ducting system further includes a row of air-grate floor panelscapable of directing said cooling airflow from said lower plenum intosaid cold aisle.
 12. The method according to claim 9, wherein saidcomputer room is a solid floor construction and said air conditioningand dueling system includes a recirculation loop, said loop comprising afirst ducting and a second ducting, said first ducting and said secondducting being positioned in an alternating alignment relative to saidcold aisles and said hot aisles so that said first ducting is capable ofsupplying said cooling airflow into said cold aisles and said secondducting is capable of removing said heated airflow from said hot aisleas a make-up air to a computer room air conditioning unit.
 13. Themethod according to claim 10 wherein operating the tilt bar assembly isa direct digital control having a predetermined set-point.